Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882139 | Improved production of carbon fibers | Siegfried Peter | 1989-11-21 |
| 4871443 | Novel method for extraction of salts from coal tar and pitches | Arnold Alscher, Rudolf Oberkobusch, Siegfried Peter, Wolfgang Jaumann | 1989-10-03 |
| 4827050 | Method for separation of phenols and bases from coal tar oils by extraction | Siegfried Peter, Marc Seekamp, Jurgen Stadelhofer | 1989-05-02 |
| 4806228 | Process for producing pitch raw materials | Siegfried Peter | 1989-02-21 |